Hello sister Rebecca,
I've been thinking about this thread and brainstorming to see what might be available on other websites for Christian women. I can understand what you're talking about with a need to have a 'women only' forum. There are times when women need to have discussions on topics that are irrelevant and unnecessary to our brothers in Christ. :) But I think there might be some other websites that would provide better options for this than SI and also a more concentrated group of women interested in these things.
http://www.aboverubies.org/ - we receive this magazine and it is very family-centered and a great resource for homeschooling moms, moms of large families or just any moms with a desire to have a godly home and family. There is a forum for women on their website. I've joined it but my membership is still awaiting approval, so I don't know what the content is like. But it looks good.
And there is an Above Rubies group on Facebook, http://www.facebook.com/group.php?gid=6342173251
http://www.reviveourhearts.com/ - while there may not be a forum on there for women, there is interaction for those who listen to the broadcast or read the transcript.
http://www.homesteadblogger.com/home.php - This looks like an excellent website and might be more along the lines of what you're looking for. I know one mother who regularly contributes on there.
https://www.christian-homemaking.com/forum/index.php - this one looks good.
Those are a few options you might consider and pray about joining and being involved in. Of course the best option is to be involved in a church that has godly women who can provide teachings and advice on those things, but in these days of apostasy and compromise I know many have to resort to the internet for godly resources and encouragement in these areas.
May the Lord bless you, sister.
~Joy
P.S. Someone else who might have some ideas is Ginnyrose...I know that she has frequented some other forums that cover more of the topics of cooking and sewing, etc.